/**
 * Copyright [2012-2013] [Guðmundur Björn Birkisson]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. Copyright [2012-2013] [Guðmundur Björn Birkisson]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * ---------------------------------------------------------------------------
 * 
 * Class name:  Direction
 * 
 * Description of class:
 * 
 * Class to help with rotation of sprites in the world.
 * 
 */

package karel.gamelogic.world;


public class Direction {
    
    public enum DirName {
        WEST, NORTH, EAST, SOUTH
    }
    
    //These numbers are rotation in radians
    //We assume that the original sprite is facing east
    private static double[] dirs = { Math.PI , -Math.PI/2 , 0 , Math.PI/2};
    
    public static double getDir(DirName dir) {
        return dirs[dir.ordinal()];
    }
    
    public static DirName turnLeft(DirName currentDir) {
        switch(currentDir) {
            case WEST:
                return DirName.SOUTH;
            case NORTH:
                return DirName.WEST;
            case EAST:
                return DirName.NORTH;
            case SOUTH:
                return DirName.EAST;
        }
        return null;
    }
    
    public static DirName turnRight(DirName currentDir) {
        return turnLeft(turnLeft(turnLeft(currentDir)));
    }
}
